Siemens simatic ET 200MP - Technical Specifications; General Information; Engineering with; Operating Mode

Interrupts/diagnostics alarms
5.3 Diagnostics alarms
Analog Input Module AI 8xU/I/R/RTD BA (6ES7531-7QF00-0AB0)
Manual, 03/2019, A5E44792324-AA
35
5.3 Diagnostics alarms
A diagnostics alarm is generated and the ERROR LED flashes on the module for each
diagnostics event. The diagnostics alarms can be read out in the diagnostics buffer of the
CPU, for example. You can evaluate the error codes with the user program.
If the module is operated distributed with PROFIBUS DP in an ET 200MP system, you have
the option to read out diagnostics data with the instruction RDREC or RD_REC using data
record 0 and 1. The structure of the data records is available in the "Manual for interface
module IM 155-5 DP ST (6ES7155-5BA00-0AB0)" on the Internet
(https://support.industry.siemens.com/cs/ww/en/view/78324181
).
Table 5- 4 Diagnostics alarms, their meaning and corrective measures
Diagnostics alarm
Error code
Meaning
Solution
Wire break 6
H
Impedance of encoder circuit too
high
Use a different encoder type or modify the
wiring, for example, using cables with
larger cross-section
Wire break between the module and
sensor
Connect the cable
Channel not connected (open)
• Disable diagnostics
• Connect the channel
Overflow
7
H
Measuring range violated
Check the measuring range
Underflow
8
H
Measuring range violated
Check the measuring range
Parameter assignment
error
10
H
• The module cannot evaluate
parameters for the channel
• Incorrect parameter assignment
Correct the parameter assignment
Common mode error 118
H
Valid common mode voltage ex-
ceeded
Check the wiring, e.g. sensor ground
connections, use equipotential cables
Diagnostics alarms with value status (QI)
If you configure the module with value status (QI), the module always checks all errors even
if the respective diagnostics is not enabled. But the module cancels the inspection as soon
as it detects the first error, regardless if the respective diagnostics has been enabled or not.
The result may be that enabled diagnostics may not be displayed.
Example: You have enabled "Underflow" diagnostics, but the module detects the "Wire
break" diagnostics first and aborts after this error message. The "Underflow" diagnostics is
not detected.
Recommendation: To ensure that all errors can be diagnosed reliably, select all check boxes
under "Diagnostics".